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what could cause foaming of the mouth with a bit of blood around the perimeter?
overdose or seizure possibly.
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Drug overdose
People use recreational drugs because they affect the brain chemistry, causing feelings like euphoria and cravings for more of the drug. Two of the most popular categories of drugs are opioids (painkillers) and stimulants, or “uppers.”
Common opioids are:
heroin
OxyContin
Vicodin
Common stimulants are:
Ritalin
Adderall
methamphetamine
If you take too much of one of these drugs, you could overdose, meaning your body can’t detox the drug before deadly symptoms take effect.
Common signs of opiate or stimulant overdose are:
foaming at the mouth or a foam cone
loss of consciousness
seizures
difficulty or stopped breathing
Overdose causes foaming at the mouth because organs like the heart and lungs can’t function properly. Slowed heart or lung movements causes fluids to gather in the lungs, which can mix with carbon dioxide and come out of the mouth like a foam.
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Seizure
When a person starts convulsing uncontrollably, they are having a seizure. A brain condition called epilepsy can cause seizures. There are also nonepileptic seizures, typically caused by trauma or psychological conditions.
Beyond convulsions, seizures can also cause:
loss of consciousness
falling
frothing at the mouth or drooling
biting your tongue
incontinence
Foamy saliva can occur during a seizure because the mouth is forced closed, which stimulates the salivary glands and makes you produce extra spit. When the mouth opens again, drool or frothy saliva can come out.
Foaming at the mouth can also occur following a provoked seizure. For example, one case studyTrusted Source examined a police officer whose partner accidentally shot him in the head with a Taser while chasing a suspect. The second officer witnessed his colleague lose consciousness, fall to the ground, and begin foaming at the mouth.
Treatments for seizures include antiepileptic medication and brain surgery.
https://www.healthline.com/health/foaming-at-the-mouth#causes